云南电网与南方电网主网异步联网系统试验分析

Experiment and Analysis on Asynchronously Interconnected System of Yunnan Power Grid and Main Grid of China Southern Power Grid

与南方电网主网异步联网后,云南电网的稳定特性将发生明显的变化,频率稳定问题将成为主要的稳定问题。为了确保云南电网与南方电网主网异步联网实施后系统的安全运行,南方电网进行了云南电网异步联网系统试验,以检验云南电网一次调频、直流FLC、稳定控制系统、第三道防线等频率控制措施。介绍了云南电网异步联网系统试验项目(4月7—9日),分析了试验中出现的主要问题和现象,并进行了仿真计算和比较,结论表明直流FLC、稳控系统能够适应云南电网异步联网后的运行要求,但云南电网的水电机组PID参数、一次调频死区设置等有待进一步优化调整。

After the asynchronous interconnection of Yunnan Power Grid （YPG）and the main grid of China Southern Power Grid （CSG）,the system stability characteristics of YPG will change dramatically,and the problem of system frequency will become the main stability problem. In order to ensure the operation security of YPG after asynchronous interconnection,a series of experiments on the asynchronous interconnected system is carried out by CSG to validate the frequency control measures including the primary frequen-cy regulation,the frequency limit controller （FLC）of HVDC,the electric power system stability control system,and the third line of defence. The experiment items from April 7 to April 9 are introduced in this paper. The main problems and cases occurred in the sys-tem experiment are analyzed,and simulation and comparison are carried out. The results show that the FLC of HVDC and the electric power system stability control system are able to adapt to the operating requirements of YPG after asynchronous interconnection,while the PID parameters of hydro trubine governors and the dead-zone settings of primary frequency regulation still need to be further opti-mized and regulated.